I only give in and have one when it´s a special occasion. Only when...
Only when it´s a special occasion do I give in and have one.
Restaurants have only recently started to print nutritional information on their menus. Only recently ...
Only recently have restaurants started to print nutritional information on their menus.
I don´t decide which restaurant to go to till I´ve satisfied myself there are some healthy options. Not until...
Not until I´ve satisfied myself there are some healthy options do I decide which restaurant to go to.